PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/22-17:57:40
G07     328.9          56.3               11.8 +/-    1.02      13.8 +/-    1.02  0.030 / 0.050
G08     109.0          51.7               14.9 +/-    0.60      18.4 +/-    0.60  0.030 / 0.060
G09     197.9          76.4               13.0 +/-    1.27      13.3 +/-    1.27  0.040 / 0.090
G11     148.5          11.3               16.2 +/-    2.94      43.9 +/-    2.94  0.050 / 0.070
G23     153.2          39.4               15.1 +/-    1.11      22.1 +/-    1.11  0.090 / 0.220
G27     56.8           32.5               11.1 +/-    0.95      18.4 +/-    0.95  0.080 / 0.230
G28     235.8          28.1               14.0 +/-    2.45      25.5 +/-    2.45  0.030 / 0.060
G30     301.1          35.0               12.0 +/-    0.71      19.1 +/-    0.71  0.030 / 0.050